/Engine/Source/Editor/AnimationBlueprintLibrary/Public/AnimationBlueprintLibrary.h
Apply all the changes made to Bone Tracks to Finalize. This triggers recompression. Note that this is expensive, but will require to get correct compressed data
static void FinalizeBoneAnimation ( [UAnimSequence](API\Runtime\Engine\Animation\UAnimSequence) * AnimationSequence )